The vertical dimension measured from the springing line to the crown extrados/intrados of an arch is termed______________?
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Answer: B. rise
Explanation
The rise of an arch is measured vertically from the springing line to the highest inner or outer point. This critical vertical dimension defines the overall profile and clearance height of the arch opening. Geometric calculations for arch stability rely directly on the accurate determination of its rise. Arches are curved structural members designed to span openings while supporting significant vertical loads. The springing line represents the horizontal level where the curved arch structure begins to rise. Architectural drawings specify arch geometry using span, rise, crown, and thickness parameters.
Builders use the rise measurement to construct accurate centering frames for masonry arch construction. Interior clearance requirements for doorways and windows dictate the minimum rise of structural arches. Bridge designers evaluate arch rise and span ratios to optimize structural thrust and aesthetic proportions. Intrados refers to the inner curved surface or boundary of an arch opening rather than a vertical height. Spandril describes the triangular exterior wall space located above the curved arch shoulder. Extrados represents the convex outer curve of the arch ring rather than a vertical distance measurement.
- Subject
- Engineering
- Category
- Civil Engineering
- Topic
- —
- Difficulty
- medium
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